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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'caf86464d19dbb903fb9d21b7370876e09a469aed016a2e59fc361483a54e019' 
  AND token = 'a4xc2uxvvzfkueGntYmfa88pgymJ9X9G+eUhWO93u2Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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