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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5a53265396f2ec19509b3e1cbe658dbf3c3adbe07031e1430c9399f46f49fe85' 
  AND token = 'QbL4n0FuXho9joIlCEtXiJXG5uM0v7B3J4T4vnMIq/A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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