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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3a7846ea0e9e1f63b214e464f539a1360430edcf717679fe4fcd683ee4f172b3' 
  AND token = 'emf8H5TE3xskLNfJNh36p6RQ94E7yF0Rk77jLN7jk8I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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