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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5c18f26ee248661ef2cfc31e55a2924746ec94305048b6d09bfd7a6a807c761a' 
  AND token = 'smQoGsfuC17f8SDhyyyeo9ZnbZ6DS+LM34+DTIn/Q7Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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