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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b84a2359ac4d1129a38d51b55ba56e463feada1e0f548ce6f39d8e170d2dad4e' 
  AND token = 'xq3ZeL1L+d9UReXW2GBUBOoYUcUMszTZaOswrxYCz1M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00012

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}