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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '77943de46b529c815c3ba0243f793a13d640e0f303339e093532c408a4b43b7c' 
  AND token = '79depgp0+I0K6OKgUHYBQvhMx9Y66AJhdOsheHpZMXw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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