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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '70b2ece8e38dc910a2dafc97912c22777e213d2813faa4396435d3a20c801c8f' 
  AND token = 'vJLvBlf3WOm1OHry2yYXbKOUL/vOA17NrEXJCshnhm0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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