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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1489a1b900c51d3199d217d352668e8e40c0b63a1352d161d0da04afd8ce2c99' 
  AND token = 'rU0WSCZk0R75nyfZl3GZ07wnaXIU9NyyNHdlK7M4D0M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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