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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '099a23bdff5a782aebcb347969ae332aad1134d49d705b4c07d397ac3b7cd030' 
  AND token = 'AiLQMYSQGIw2Mx4fS/4wCtewebIhJlcGQoHhNUAsCKQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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