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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd176bad89c692772530b81576ad32b5b26d513382e8898708a4095b2442a86d7' 
  AND token = 'p2ICakHMQG7mxaVvYIrL+D9ZKBal7IjS9a3HT1/hl9A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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