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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5066d479c224154cd081e40c285f0e09e7c7d719494db66d847a4a37fa08998c' 
  AND token = 'ppFdv9w6v255FjtN+ka/A21CpBEZDndCkM37C2J2F1A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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