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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e031d7cc2f264de53b7fb38ae91e7d20b0ba80a497c553dee568f76392550320' 
  AND token = '0kOpC09m8uxfOUBvnK8Qo9y4KVm9B8VLXibWpsYXwjc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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