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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a215327ba1bff4f24447e9b12181c9d066fc71d53a5d1d704b8af7816ab9013e' 
  AND token = 'JQwTYfISm2Otg9RV6118DpYnwUrphquVQGTXpeK9a1Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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