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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c04dca6e32bc9cd11dcdf1c723ed3915b9c329843c26ba7801298d081c968369' 
  AND token = 'Wz4T9xSfGnShk0gGGBuiTa37DD3Hk8zt33grPryWQ/A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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