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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2038578d32d1cd2a9d1a795aad245b6afa3052221069ede4f7a565cb3308419e' 
  AND token = 'mOJCAHuQH0ehTF7ri5er7YSrUxcV4bH7/MB/aIhoIhs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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