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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '06d5599044e50cf3006972dc6b93063af08672fd7fe1d4c04a759151a9cb38eb' 
  AND token = 'dNH2NBdmSJcqcxPiHZhxNGL84rOwP1rWGLaXkL55J5M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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