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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '979b025b884c7703c296ae2ed53e3cfcaca37c92cd0f0069624ff2317865fcad' 
  AND token = 'JPl36xrxjfTB5dgz0opBokj93FvuBd6R6UbL85onwPY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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