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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '985c884d70377b3509fef06982ac29642b8fd8a359db27d3c6fb23f83d4f01ce' 
  AND token = 'DOWcEXXD9Huf19GGtw+GD5V9aV6xoinzmSw2X+lWFls=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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