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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8d6f479483e1be7e7d9271e7d7d9c954f3f0580af41fbf3bbd06e0a85bcf598e' 
  AND token = 'edpdRzQcCE7XiwGJpNy49Wkh1VZi/hrRSkpx/CT4WhY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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