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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e48cb00c1fc42ca254d93b415ba6c406ae1fff1215d1a63d0b6e1b8fe806b57a' 
  AND token = 'h/A5hDEyHW0w/Ujh15aDomNrtay3lOfNFDJnK/hPp9E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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