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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4316b611317b3a88cadcb724fb2c1a2bd100b0b24bca46dc934078d6e8966fa1' 
  AND token = '/5WajnXIGkQQWySlLvzk9lTJKlcL4b5rIkGvVtKm3gM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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