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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5372af04c5c35b8ac02f713cbf9ca7ed09b6bb8e6d8d774db814acb266617132' 
  AND token = 'QBYF1Jx8V3EzznD9u577b3LhvnchDzygL4WRZTW0hxE=' 
  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"
    }
  }
}