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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '83ea2dcfe4a3f00e157187b2b6d7f91f5116e8a57925ff320c6966c1a47dd6a1' 
  AND token = 'AqkJMSXh2vrEfNVLE6WbOcP773XiTwqslepAJUqUg6E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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