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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '52f1c0e0bd13e9ce64af3b9a8d908de57779572bd53d45d1981a2bbde19eef58' 
  AND token = 'iQl/WR3Og4Nz3W/bqB91m3P46axbgLR9IhrmlDSmK+E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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