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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '60d1935b707d4b5063986a6979ea1b529d75b1b659bc519c6183b8f13137a1ea' 
  AND token = 'MZXWSVt5EO/RUsj7F2ck7ZiLOCT8jAXYnw5KqqwLCN0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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