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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a6db5b5be905b5f045a48277d132534741988c2311dffa72ae32c4bc6786136d' 
  AND token = 'fl0Kj5hO8mAz8KAENnOdx5m8sVgF7w0u8+HRhC5mIYA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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