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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd53342207e8dcf839babdfc38a41b4ecdc17c4fe564b2e8087e6059214fc680b' 
  AND token = 'hcW0RhOKC4MVhy/fO77DpBBYpqg5yoDsqfUGCmbm6aY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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