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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8ae6f580265cc2ee2cc7383a40545a3933c2ce4548b831108f2e72eb9ba903cb' 
  AND token = 'pwBTwLl7gO1QV9ELFRPx3o5lvvZsixHyq4b7PGpbyow=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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