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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3efb0f8e61e59d829d32b17b080fd23e14aa5b18b0d0c73abe28ff551ce07826' 
  AND token = 'WKVtlhzjWsu0aP4fa37jLMn3FpnAHqn0xH83FcLIxmc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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