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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '911a6e0f115c0b4f1e2208f23db76174b48aa18b7c88b44372d2dc8c88e9eaeb' 
  AND token = '0LyDBCbumYxTp0y5J7zGp94YiARjoB0qoZnAGhHPpqg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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