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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'edae45bf3f3cf3e3b01340109bc1d0bb98558526c0d994b1a7e9be9e0f285a34' 
  AND token = 'Ge4pebLYDdtjxNKvDOLfdeyZHt3CX70Va3nbG/wPV/c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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