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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b33040e677554cf97c2041a52fb7ee788a3a95279da6c26d570ec9a15ddff035' 
  AND token = '6k+8iBOZeyMbbCGIX/PJUV52Bq0qaxVwywedKtr/l7k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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