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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bf3e068bb33ed1277f83d93ba1483e683e52ed24abbd0aeb3fc160e3bb4d2a85' 
  AND token = 'lGQ7Ap26oxDu4eEAMEKHBLTdgx6lzwmJ9+dtg7qUYa4=' 
  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"
    }
  }
}