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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2fc2a40882bd7962d1ad75cabf978aa4c58958a703f97ee0640209a054d3ab04' 
  AND token = 'R1Od7xAParBMin7ox2T+ANNrHW0gaoqXQe2/tmDsFKY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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