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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ac7a9648bd171611f4885e665c904b89983e00e1b3d302720c819402c796588f' 
  AND token = 'vXIaID0j1qC8BQOIAdFW+VCcXx3Gwjsnfnkp17qzal0=' 
  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"
    }
  }
}