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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0ea1b44c5d080715ba41e7b6bf08f157ab1c8a413ca46934afbf6103091ce7c0' 
  AND token = 'kAFNA9/0XZuLDWBgc9WZ1T0jEfV2kQo4WiYoLHOeOYY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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