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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f1fa69925e20a1be73cf3a6a24980053fb60ae4b8f9ccc5c1a4e35b139f7ac4c' 
  AND token = 'QeQJ+7fP6lwvDov66tYRkxN87v5nCyIyDiyjI2utDzg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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