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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f8023206dd7e0da80cc42db9ba4e97a7ed70e2b23918f57b0a82d83be9c955fc' 
  AND token = '2dpxVXOGwjo1Bp4WmJHaCZ+74FusXcsDMeo2wIAQrtc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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