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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8147d89f31786f575119de3e9547daa7609c93ed147aa0a598402792f19c1c56' 
  AND token = '56Ll4hnXfi6OVXGAtgf49aQdZ6YIglVjwVjF4FwFnUY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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