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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8415a0240198951173358fb878d0f5fad63667c7da80468936c87af78479edbb' 
  AND token = 'mMd9A6TpqyiaYQcuvwVhr8hy1Jh7waPAP4Ed8RKtxWs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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