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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '547faf78560d25eb3c4eeb47626004409c4040a92dce8d3f54484367bd685057' 
  AND token = 'lzCgw17sri/XMqP+F4N+65gLXY288K4xuieOMA7oMMk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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