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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1a9903347d9181922deaa1d78aa21e86142502a6f6e1f3dfe3e6e2fbcfb9ec65' 
  AND token = 'hty9gnKNIXvwcf+gV/ouU4rayMDXSGQmda7lkL1jR+k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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