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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ed78d1626dfbebb5d037e6d4b7dea0c4bc079cbe4c20b36915d431b7aee15512' 
  AND token = '0K5W/x6dnDayQ6FKgZUH9akmsM6U4rAPq5hAljnnbd8=' 
  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"
    }
  }
}