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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '54a7b028b65af224b83b31b6aad9b12cad7db86cbc3d93b66ca2aa1a20480a6f' 
  AND token = 'Xco3rmt+2j5EouzGs/7AmGsBm5rVjJtmnpnR2NzhMkw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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