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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '402da83bf8e4b17297f35022012e7aeb1e3f1f5387e2e2b44e5c18dda5003f8b' 
  AND token = '2hYnVP9alb2QQObBJDFoxTljDYTIdHNbc/1kJp3BLhI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00059

JSON explain

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