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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'faa82aad02580fcb2f8da08e81597041b87625fe2a1f53642e3ecf2ec8285e9d' 
  AND token = 'ac00EpkcsJMf3YXtFcM0/Bk85X2YxhUrxDUMZ5QChAk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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