Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b3af31aafe424dcec4a06a3daa7649e1d2f95df55ec91bfaa331f22daaa0b69d' 
  AND token = '6ZoF9E7t1plBWOnZ1pxLuOsl/b4Ckh0+67I+fq2pByc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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