SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1196be7ef19d5aa4c319cc9dc1f4d5fb260986f2106e353ea369f33208d894f2' 
  AND token = 'WXagjqFNzcdYKS/wY9F+tgxKng/Eb35YIbtDhZNIXOg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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