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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8a17eac737d6dbff9d5faa8e874e3bd3cdbba1f98f3e00f4d35155dfef741b1b' 
  AND token = '75b3C7bTWNgNQR39O8qyZ2k1M/xQcW/jjEbLnNyXReA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00056

JSON explain

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