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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c43b338c9aae9bbc00be626b8e3d56d98204cc5f73ee41f71e1228b2069e6d63' 
  AND token = 'JlcbG1R4bIVikJw3rQLohlGIdaKTc3C3Tb20TJTBS/I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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