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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6e788a42861f9a800a46394474be3c17c5b93d8dab7a3f04d547b0e6f981192b' 
  AND token = 'npun4OK5pETCgdoHpZ0NaQTI+ssz884hVt/d1m0jH7I=' 
  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"
    }
  }
}