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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f9526586d5bca480c2cabd304d5a63e3b5a3abca51e34d83ee9c790e84ad1e96' 
  AND token = 'bYnDj7Q7Ctcx/n0cyYMNFbky6JJkycneXeW+ncMEgV4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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