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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'af044370e95a2da079828edcf9988235c549d83f9dc910e4f6bfec2e2e7b1005' 
  AND token = 'l+ziPjeT01uHcIdddDUYwN/XTJOhLNYc+eHVScas3D8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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