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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd7ce93a8d60feb4e1a1a7fb7d37fcf400a49d1e242244cdc41d718a0f65b47f1' 
  AND token = 'tH3XiR2+RSpXFPu6ZlQZUFowghB62bY4Z9Z295qa+Co=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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