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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4f6aa0a6415b3abc5fe453101df1fe89d18550789df41c541def00b416c0be6a' 
  AND token = '/3hyURRPgdASEJlQ17EhemGn4LUR3i7ROodzReY8lIE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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