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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b9a86c2017a2e6007088a6c54e929e2a15dfb9c46fad23853d23a9d971e28779' 
  AND token = 'vOC5r6RV9sc7o4cXmQ9EhpZYa18EHXmTo8QSaYhZDlo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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