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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '354d6656f518ff6e0eb4e8fe2f9678edd3c1104b5fcfabfbe29d047accd83503' 
  AND token = 'hC9PYqLUyyqDea5GRuDTeYiN8PGuvilXtj/rE3B/vv4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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