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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7ab37b515bcc24f09b87da8e6f67643a61ca99a4f67ca81ab589032dbcdd9d18' 
  AND token = 'tg3wA4U3foXy1keu7eAN7rDzzwJxbtjwUvCzqoZIdmc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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