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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '823f94173b222b3b3d0639cf276fdad9aaf1328031bc686dead8573280251393' 
  AND token = 'rMnA3vXJ7malSd0hoDDdG4Rk+Omk/7hsCd5kwHuhYW8=' 
  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"
    }
  }
}