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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7ad0d3028efcca4620079cd647b0d5b61acae6057b8d106e46d4d0304da58acd' 
  AND token = '1T90mbVWqyn3wmyF++SfvtPd+V8JZusAnTN95ktlMsY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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