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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a72fff2c282c2e5b1f56ed39e233fc1932159fdef23f857085b772c2ab9d407c' 
  AND token = 'XivqV/vmng+ZM8HA+ESaisM0LB67E9CnJamu08oEvSc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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