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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '13517c9def89c17a87d8eef1e05e5a39a4b7ce0ba8655bccbc3346baa5b5f5c9' 
  AND token = 'CCWms1hY58a3EmSxmcFiasi2nsXtgh9vtj+DjaNzdqA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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