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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6a97a00ae70df17752a0cd2c9472d6e36cdc80d83b3230f06dadc5c6e32a9326' 
  AND token = 'cSMQsh+H11HEsoddoXGXdTsBvNcBITcIRtItL42Vf8c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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